Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Microstructure and Unusual Ferromagnetism of Epitaxial SnO2 Films Heavily Implanted with Co Ions

Rustam I. Khaibullin
ORCID logo ,
Amir I. Gumarov
ORCID logo ,
Iskander R. Vakhitov
ORCID logo ,
Andrey A. Sukhanov
,
Nikolay M. Lyadov
,
Airat G. Kiiamov
ORCID logo ,
Dilyara M. Kuzina
,
Valery V. Bazarov
,
Almaz L. Zinnatullin
* ORCID logo
Version 1 : Received: 30 December 2023 / Approved: 4 January 2024 / Online: 4 January 2024 (07:05:43 CET)

How to cite: Khaibullin, R.I.; Gumarov, A.I.; Vakhitov, I.R.; Sukhanov, A.A.; Lyadov, N.M.; Kiiamov, A.G.; Kuzina, D.M.; Bazarov, V.V.; Zinnatullin, A.L. Microstructure and Unusual Ferromagnetism of Epitaxial SnO2 Films Heavily Implanted with Co Ions. Preprints 2024, 2024010296. https://doi.org/10.20944/preprints202401.0296.v1 Khaibullin, R.I.; Gumarov, A.I.; Vakhitov, I.R.; Sukhanov, A.A.; Lyadov, N.M.; Kiiamov, A.G.; Kuzina, D.M.; Bazarov, V.V.; Zinnatullin, A.L. Microstructure and Unusual Ferromagnetism of Epitaxial SnO2 Films Heavily Implanted with Co Ions. Preprints 2024, 2024010296. https://doi.org/10.20944/preprints202401.0296.v1

Abstract

In this work, we have studied microstructure and unusual ferromagnetic behavior in cobalt (Co)-implanted epitaxial tin dioxide (SnO2) films. The study was aimed to provide a comprehensive understanding of the interplay between cobalt implant distribution, crystal defects, such as oxygen vacancies, and magnetic properties in Co-implanted SnO2 films, which has potential applications in spintronics and memristor devices. The scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM), differential thermo-magnetic analysis (DTMA), and ferromagnetic resonance (FMR) were employed for investigations of SnO2 films implanted with 40 keV Co+ ions at room or the elevated temperatures of substrate. The experimental data showed that the Co ion implantation with high fluence of 1.0 1017 ions/cm2 induces significant changes in the microstructure of SnO2 films, leading to the appearance of ferromagnetism with the Curie temperature significantly above room temperature. Strong influence of implantation temperature and subsequent high-temperature annealing in air or in vacuum on magnetic properties of Co-implanted SnO2 films were established. Moreover, the chemical effect of ethanol on FMR spectra were observed. The obtained results are discussed within the model of two magnetic layers with different concentration and valence states of the implanted cobalt and with high content of oxygen vacancies.

Keywords

cobalt implantation; tin dioxide; microstructure; ferromagnetism; scanning electron microscopy; X-ray diffraction; X-ray photoelectron spectroscopy; vibrating sample magnetometry; ferromagnetic resonance; spintronics

Subject

Physical Sciences, Applied Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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